Add HiDPI xwayland + wlroots patches (#591)

nix/default.nix

@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  fetchpatch,
   pkg-config,
   meson,
   ninja,
@@ -21,78 +22,88 @@
   xwayland,
   debug ? false,
   enableXWayland ? true,
+  hidpiXWayland ? true,
   legacyRenderer ? false,
   version ? "git",
-}:
-stdenv.mkDerivation {
-  pname = "hyprland" + lib.optionalString debug "-debug";
-  inherit version;
-
-  src = lib.cleanSourceWith {
-    filter = name: type: let
-      baseName = baseNameOf (toString name);
-    in
-      ! (
-        lib.hasSuffix ".nix" baseName
-      );
-    src = lib.cleanSource ../.;
-  };
-
-  nativeBuildInputs = [
-    meson
-    ninja
-    pkg-config
-  ];
-
-  outputs = [
-    "out"
-    "man"
-  ];
-
-  buildInputs =
-    [
-      git
-      libdrm
-      libinput
-      libxcb
-      libxkbcommon
-      mesa
-      pango
-      wayland
-      wayland-protocols
-      wayland-scanner
-      (wlroots.override {inherit enableXWayland;})
-      xcbutilwm
-    ]
-    ++ lib.optional enableXWayland xwayland;
-
-  mesonBuildType =
-    if debug
-    then "debug"
-    else "release";
-
-  mesonFlags = builtins.concatLists [
-    (lib.optional (!enableXWayland) "-Dxwayland=disabled")
-    (lib.optional legacyRenderer "-DLEGACY_RENDERER:STRING=true")
-  ];
-
-  patches = [
-    # make meson use the provided wlroots instead of the git submodule
-    ./meson-build.patch
-  ];
-
-  # Fix hardcoded paths to /usr installation
-  postPatch = ''
-    sed -i "s#/usr#$out#" src/render/OpenGL.cpp
+}: let
+  assertXWayland = lib.assertMsg (hidpiXWayland -> enableXWayland) ''
+    Hyprland: cannot have hidpiXWayland when enableXWayland is false.
   '';
+in
+  assert assertXWayland;
+    stdenv.mkDerivation {
+      pname = "hyprland" + lib.optionalString debug "-debug";
+      inherit version;
 
-  passthru.providedSessions = ["hyprland"];
+      src = lib.cleanSourceWith {
+        filter = name: type: let
+          baseName = baseNameOf (toString name);
+        in
+          ! (
+            lib.hasSuffix ".nix" baseName
+          );
+        src = lib.cleanSource ../.;
+      };
 
-  meta = with lib; {
-    homepage = "https://github.com/vaxerski/Hyprland";
-    description = "A dynamic tiling Wayland compositor that doesn't sacrifice on its looks";
-    license = licenses.bsd3;
-    platforms = platforms.linux;
-    mainProgram = "Hyprland";
-  };
-}
+      nativeBuildInputs = [
+        meson
+        ninja
+        pkg-config
+      ];
+
+      outputs = [
+        "out"
+        "man"
+      ];
+
+      buildInputs =
+        [
+          git
+          libdrm
+          libinput
+          libxcb
+          libxkbcommon
+          mesa
+          pango
+          wayland
+          wayland-protocols
+          wayland-scanner
+          (
+            if hidpiXWayland
+            then (import ./hidpi_wlroots.nix {inherit wlroots xwayland fetchpatch;})
+            else wlroots.override {inherit enableXWayland;}
+          )
+          xcbutilwm
+        ]
+        ++ lib.optional enableXWayland xwayland;
+
+      mesonBuildType =
+        if debug
+        then "debug"
+        else "release";
+
+      mesonFlags = builtins.concatLists [
+        (lib.optional (!enableXWayland) "-Dxwayland=disabled")
+        (lib.optional legacyRenderer "-DLEGACY_RENDERER:STRING=true")
+      ];
+
+      patches = [
+        # make meson use the provided wlroots instead of the git submodule
+        ./meson-build.patch
+      ];
+
+      # Fix hardcoded paths to /usr installation
+      postPatch = ''
+        sed -i "s#/usr#$out#" src/render/OpenGL.cpp
+      '';
+
+      passthru.providedSessions = ["hyprland"];
+
+      meta = with lib; {
+        homepage = "https://github.com/vaxerski/Hyprland";
+        description = "A dynamic tiling Wayland compositor that doesn't sacrifice on its looks";
+        license = licenses.bsd3;
+        platforms = platforms.linux;
+        mainProgram = "Hyprland";
+      };
+    }